Zobrazeno 1 - 10
of 21
pro vyhledávání: '"J. T. Simola"'
Publikováno v:
Cryogenics. 32:791-798
We describe two types of viscometer utilizing metallic microspheres. These spheres are set into stationary translational motion or into translational oscillations. The motion of these charged microparticles is induced and detected via an electric fie
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d136ea7b65c052807632a179008dbca3
https://doi.org/10.1016/0011-2275(92)90311-w
https://doi.org/10.1016/0011-2275(92)90311-w
The oscillations of a small magnetic sphere (radius 100 μm) levitated above a superconductor are investigated. Resonance frequencies between 300 Hz and 600 Hz are observed. At low amplitudes (≤1 gmm) the oscillator has Q values of about 106. At la
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f932fe3a172f9d5bf66c45d7d460bfbd
https://epub.uni-regensburg.de/18823/
https://epub.uni-regensburg.de/18823/
Autor:
J. T. Simola, Juha Tuoriniemi
Publikováno v:
Physica B: Condensed Matter. :121-122
Our method for measuring viscosities of nonconductive fluids in the range η ≥ 10 −4 Pa·s is characterized by a well defined flow geometry, a very small dissipative heating of the fluid, P ∼10 −12 /η Watts, and a small sample volume, V ∼
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b16e3fc3f5f4cc308fdc8cf092fce5a8
https://doi.org/10.1016/s0921-4526(90)80910-b
https://doi.org/10.1016/s0921-4526(90)80910-b
Publikováno v:
ResearcherID
A new type of high sensitivity viscometer is presented, reaching Q-values of up to one million at 0.3 kHz resonance frequency. Possible applications to thermometry and for the creation and detection of vortex rings in superfluid helium are discussed.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6c360860ab212bf48a956397c4cd6794
https://doi.org/10.1016/s0921-4526(90)80909-3
https://doi.org/10.1016/s0921-4526(90)80909-3
Autor:
Riitta Salmelin, A. D. Gongadze, Martti M. Salomaa, Pertti Hakonen, G. A. Kharadze, Matti Krusius, J. T. Simola, G. E. Vachnadze
Publikováno v:
Journal of Low Temperature Physics. 76:225-283
We have performed NMR measurements on the flare-out texture of superfluid3He-B in a cylindrical container of 5 mm diameter in axial magnetic fields of 28.4 and 56.9 mT. The transverse cw NMR spectra have been analyzed both with respect to their overa
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e0dc32de3d603fd8370953793420b00b
https://doi.org/10.1007/bf00681586
https://doi.org/10.1007/bf00681586
Publikováno v:
Journal of Low Temperature Physics. 75:111-157
The interaction between negative ions and 3 He superfluids was studied by using a time-of-flight spectrometer having a 10−3 relative resolution. The ions guided through a sample of rotating3He-A were found to be focused into the cores of the vortic
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::17d153f2ff1e05568e467b18518a6ecc
https://doi.org/10.1007/bf00681907
https://doi.org/10.1007/bf00681907
Publikováno v:
Physical Review Letters. 53:70-73
We have investigated persistent flow of superfluid $^{3}\mathrm{He}$ with an ac gyroscope filled with 20-\ensuremath{\mu}m powder. In $^{3}\mathrm{He}$-$B$, currents circulate undiminished for 48 h at least; this implies a viscosity 12 orders of magn
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ee3fc4d530682d83f1ac0bf29328d606
https://doi.org/10.1103/physrevlett.53.70
https://doi.org/10.1103/physrevlett.53.70
Autor:
Jukka P. Pekola, J. T. Simola
Publikováno v:
Journal of Low Temperature Physics. 58:555-590
Measurements are reported of persistent currents in superfluid3He-B and3He-A. An ac gyroscope filled with 20 µm powder and mounted into a rotating nuclear refrigerator was employed. In3He-B, undiminished circulation was observed for 48 h; this impli
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::70d65b3cdf182210402ce379a4023e70
https://doi.org/10.1007/bf00681144
https://doi.org/10.1007/bf00681144
Publikováno v:
Canadian Journal of Physics. 65:1449-1452
Ion-mobility experiments on rotating superfluid 3He–A show that the l-vector texture in the liquid strongly focuses ions to vortex cores and that two different kinds of vortices, with clearly different ion mobilities along their cores, exist in the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2d81cc6e5e79a0497c2e738f79649330
https://doi.org/10.1139/p87-229
https://doi.org/10.1139/p87-229
Publikováno v:
Physical Review Letters. 58:678-681
We report measurements on a new collective spin-wave mode trapped by the textural boundary layers of /sup 3/He-A within a stack of thin Mylar plates. The surface mode was seen as a new peak in the cw NMR spectrum measured at H/sub 0/ = 284 Oe. Rotati
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::67b031cdb08aa914ed7104b29397a328
https://doi.org/10.1103/physrevlett.58.678
https://doi.org/10.1103/physrevlett.58.678